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Apache Spark commented on SPARK-23979:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/21065
> MultiAlias should not be a CodegenFallback
> ------------------------------------------
>
> Key: SPARK-23979
> URL: https://issues.apache.org/jira/browse/SPARK-23979
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Liang-Chi Hsieh
> Priority: Trivial
>
> I just found {{MultiAlias}} is a {{CodegenFallback}}. It should not be as looks like
{{MultiAlias}} won't be evaluated.
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